Xiang, D.Colby, E.Dunning, M.Gilevich, S.Hast, C.Jobe, K.McCormick, D.Nelson, J.Raubenheimer, T. O.Soong, K.Stupakov, G.Szalata, Z.Walz, D.Weathersby, S.Woodley, M.Pernet, P.-L.2011-05-132011-05-132011-05-13201010.1103/PhysRevLett.105.114801https://infoscience.epfl.ch/handle/20.500.14299/67332WOS:000281652700007We report the first experimental demonstration of the echo-enabled harmonic generation technique, which holds great promise for generation of high-power, fully coherent short-wavelength radiation. In this experiment, coherent radiation at the 3rd and 4th harmonics of the second seed laser is generated from the so-called beam echo effect. The experiment confirms the physics behind this technique and paves the way for applying the echo-enabled harmonic generation technique for seeded x-ray free electron lasers. © 2010 The American Physical Society.AcceleratorsFree Electron Laserstext::journal::journal article::research article